jayleung
Member level 5
quarter wavelength transformer
hi, everyone.
I am doing a printed circuit design in 60GHz range.
The basic structure is 2-dielectric substrate tapes with 3 copper layers on top/in between/ on bottom. The total thickness is 203um+406um=609um, and with DK=3.55.
Structure:
copper
-----------------
Rogers 4003
-----------------
copper
-----------------
Rogers 4003
-----------------
copper (GND)
The broad-side coupled strip line is going to be used as transmission line, printed on the top and middle. The characteristic impedance is obtained by IE3D modua -> Process -> Find transmission line parameters.
The quarter-wavelength transformer is designed with 100Ohm-70Ohm-50Ohm cascaded transmission line.
However, it seems the simulation is not pretty stable, since the simulation results changed with altering the 50Ohm/100Ohm feeding line length.
I am not quite sure in this range, the higher-order/surface wave mode will affect the simulation and the results.
Has anyone designed this type of structure at such high frequency before? Any experiences or advised will be appreciated. Thanks in advance.
The attachments are the transmission line for 50/70/100Ohm and the quarter-wavelength transformer IE3D geo files.
hi, everyone.
I am doing a printed circuit design in 60GHz range.
The basic structure is 2-dielectric substrate tapes with 3 copper layers on top/in between/ on bottom. The total thickness is 203um+406um=609um, and with DK=3.55.
Structure:
copper
-----------------
Rogers 4003
-----------------
copper
-----------------
Rogers 4003
-----------------
copper (GND)
The broad-side coupled strip line is going to be used as transmission line, printed on the top and middle. The characteristic impedance is obtained by IE3D modua -> Process -> Find transmission line parameters.
The quarter-wavelength transformer is designed with 100Ohm-70Ohm-50Ohm cascaded transmission line.
However, it seems the simulation is not pretty stable, since the simulation results changed with altering the 50Ohm/100Ohm feeding line length.
I am not quite sure in this range, the higher-order/surface wave mode will affect the simulation and the results.
Has anyone designed this type of structure at such high frequency before? Any experiences or advised will be appreciated. Thanks in advance.
The attachments are the transmission line for 50/70/100Ohm and the quarter-wavelength transformer IE3D geo files.